add_library(MathFunctions mysqrt.cxx)

target_include_directories(MathFunctions INTERFACE ${CMAKE_CURRENT_SOURCE_DIR})

# does this system provide the log and exp functions?
include(CheckCXXSourceCompiles)
check_cxx_source_compiles("
  #include <cmath>
  int main() {
    std::log(1.0);
    return 0;
  }
" HAVE_LOG)
check_cxx_source_compiles("
  #include <cmath>
  int main() {
    std::exp(1.0);
    return 0;
  }
" HAVE_EXP)

if(HAVE_LOG AND HAVE_EXP)
    target_compile_definitions(MathFunctions
            PRIVATE "HAVE_LOG" "HAVE_EXP")
endif()